338 J. G, BAKER ON SOME NEW SPECIES OF IITMENOPHYLLACE-ai. 



§§ Venation pinnate, or fronds at any rate furnished with a 



distinct central costa from the hase to the apex. 



Without spurious veins, 



10. T. Bahklianum, n. sp. Frondibus stipitatis lineari-oblongis indi- 

 visis, venis pinnatim dispositis, venuUs spuriis nuUis, involucro soli- 

 tario terminali, ore integro late alato* 



Ehizome slender, creeping, copious^)' branched, matted with 

 brown tomentum. Stipes one to two lines long, tomentose, 

 Prond membranaceous in texture, not more than two or three 

 lines long by one broad, in shape irregularly linear-oblong, the 

 edge a distinct undulated line, more or less clearly ciliated, the blade 

 furnished with a distinct midrib, from which proceed, at an angle 

 of about 45^, to the margin, at nearly regular intervals, six to eight 

 erecto-patent lateral veins on each side ; intervenary spaces not 

 reticulated ; sori solitary, placed at the apex of the terminal vein, 

 into which the base is narrow^ed gradually ; the mouth broadly 

 winged, but not two-lipped ; the apex of the frond continuous 

 with the Aving on one side ; the receptacle equal to the involucre 

 or exserted. Discovered by Sir Henry Barkly, the Governor of 

 Mauritius, and Lady "Bartly, at the Tamari cascade in that island. 

 This species and Hymenophyllum parvifoUum, described below^, are 

 probably the most diminutive of known ferns, as it would take 

 upwards of fifty fronds of average size to cover a square inch. 

 This species and the next would probably be considered by Tan 

 den Bosch a distinct genus, differing from Microgonmm by the 

 absence of spurious venules. 



11. T. ViTiENSE, n. sp. Frondibus substipitatis oblongis integris vel 

 bifidis costa centrali sola, venis lateralibus et venulis spuriis nulhs> 

 involucro solitario terminali incluso, ore integrq subdilatato. 



Forming close densely matted patches. Ehizome slender, wide- 

 creeping, branched, tomentose. Stipes one to three lines long, 

 sometimes absent. Pronds linear-oblong or oblong, usually undi- 

 vided, occasionally emarginate or bifid, quite entire at the margin, 

 furnished with a distinct midrib, but without either lateral veins 

 or spurious venules ; involucre urceolate-cylindrical, solitary, ter- 

 minal, quite sunk in the frond, the slightly dilated entire mouth 

 equalling the margin. 



Fiji, Milne. 



Readily distinguished from the preceding by being without 

 lateral veins. When the frond is forked, the midrib divides and 

 is prolonged down the centre of each lobe. 



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